Problem: code coverage not working

Solution: build tests within cppzmq build, and add separate demo

.travis.yml

@@ -41,4 +41,4 @@ script:
   - ./ci_build.sh
 
 after_success:
-  - coveralls --root . -E ".*external.*" -E ".*CMakeFiles.*" -E ".*tests/" -E ".*libzmq/"
+  - coveralls --root . -E ".*external.*" -E ".*CMakeFiles.*" -E ".*tests/" -E ".*demo/" -E ".*libzmq/"

CMakeLists.txt

@@ -63,3 +63,6 @@ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
               DESTINATION ${CPPZMQ_CMAKECONFIG_INSTALL_DIR})
 install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/libzmq-pkg-config/FindZeroMQ.cmake
               DESTINATION ${CPPZMQ_CMAKECONFIG_INSTALL_DIR}/libzmq-pkg-config)
+
+enable_testing()
+add_subdirectory(tests)

ci_build.sh

@@ -29,11 +29,13 @@ pushd .
 mkdir build
 cd build
 cmake ..
+cmake --build .
 sudo make -j4 install
+make test ARGS="-V"
 popd
 
-# build cppzmq tests
-cd tests
+# build cppzmq demo
+cd demo
 mkdir build
 cd build
 cmake ..

demo/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
+
+project(cppzmq-demo CXX)
+
+find_package(cppzmq)
+
+enable_testing()
+add_executable(
+    demo
+    main.cpp
+    )
+
+target_link_libraries(
+    demo
+    libzmq
+    )
+
+add_test(
+  NAME
+    demo
+  COMMAND
+    ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR}/demo
+  )

demo/main.cpp

@@ -0,0 +1,8 @@
+#include <zmq.hpp>
+
+int main(int argc, char** argv)
+{
+    zmq::context_t context;
+    
+    return 0;
+}

tests/CMakeLists.txt

@@ -3,12 +3,11 @@ cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
 project(cppzmq-test CXX)
 
 # place binaries and libraries according to GNU standards
-# TODO check if we should do this
 
-# include(GNUInstallDirs)
-# set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
-# set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
-# set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
+include(GNUInstallDirs)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
 
 # we use this to get code coverage
 if(CMAKE_CXX_COMPILER_ID MATCHES GNU)
@@ -20,10 +19,6 @@ fetch_googletest(
     ${PROJECT_SOURCE_DIR}/cmake
     ${PROJECT_BINARY_DIR}/googletest
     )
-    
-find_package(cppzmq)
-
-enable_testing()
 
 add_executable(
     unit_tests
@@ -36,6 +31,8 @@ target_link_libraries(
     libzmq
     )
 
+target_include_directories(unit_tests PRIVATE ..)
+
 add_test(
   NAME
     unit